This is informative and would work great as a shorter piece focusing on one part of the interview and as an overall look at prostitution.

It would work as a 29:00 piece if it had more sound variety. Maybe the producer could have gone and checked it out in person, pretend he's an ATM salesman or something (is Mustang Ranch still a "working" ranch?).

I don't think this works as a 29:00 piece because as a phone interview it just doesn't have the variety of sound a long piece needs. If you are producing a piece on prostitution, this would be a good part of the overall piece.